JP5817358B2 - Double torsional damper - Google Patents

Description

  More particularly, the present invention relates to a double torsional damper in which a suppression wire of the double torsional damper has a weight drop prevention mechanism.

  When wind blows on the overhead electric wire, Karman vortex, which is a cross-spreading vortex, is generated on the leeward side of the electric wire, and vibration having an amplitude of 1 to several tens of millimeters is generated. This vibration gives repeated stress to the electric wire at the reflection point of vibration such as a suspension support point or a tension clamp which becomes a fixed point of the overhead electric wire, and causes the metal fatigue deterioration and breakage with time. In order to prevent this, a vibration preventing device is attached in the vicinity of the support point of the overhead electric wire.

  FIG. 4 is a damper configuration diagram showing the configuration of a double torsional damper which is a conventional vibration preventing device. In FIG. 4, the double torsional damper 110 includes a restraining wire 50, a weight 20, and a wire gripping clamp 30. The weight 20 includes a fixing portion 28 that is fixed to the suppression wire 50, and is fixed to both ends of the suppression wire 50. The wire gripping clamp 30 includes a clamp portion 35 that grips the overhead wire 40 and a restraining wire compression hole 37 that is fixed to the restraining wire 50, and the restraining wire compression hole 37 is compressed at the center of the restraining wire 50. The restraining wire 50 is fixed and attached to the overhead electric wire 40 by the clamp portion 35.

  In the double torsional damper 110 of FIG. 4, the vibration of Karman vortex generated by the wind is transmitted to the suppression wire 50 and the weights 20 at both ends via the clamp portion 35. As a result, a new vibration is generated in the suppression line 50. This new vibration has a phase and period different from those of the Karman vortex, and acts to cancel the vibration of the Karman vortex, thereby preventing the fatigue and breakage of the overhead wire 40 over time.

  By the way, the conventional suppression wire 50 consists of the same core wire and a plurality of outer peripheral lines, and a plurality of outer peripheral lines are formed by being twisted around the core wires. However, when new vibrations that act to cancel vibrations due to Karman vortices are repeatedly generated in the deterrence line 50 over a long period of time, the same core wire of the deterrence line 50 and a plurality of outer peripheral lines rub against each other, resulting in metal A part of the restraining line 50 is broken due to fatigue deterioration, and the weight 20 hangs down. In the worst case, the weight 20 falls.

  FIG. 5 is a breakage line breaking diagram showing a state of a weight at the time of breakage of a conventional inhibition line. FIG. 5 shows a state in which a part of the inhibition line 50 of the double torsional damper 110 is broken due to metal fatigue deterioration, and the weight 20 hangs down. However, since only a part of the restraining line 50 breaks at the initial stage of breakage, the sagging angle θ of the weight 20 is small, and the sagging of the weight 20 is found at the time of periodic inspection and is immediately replaced. It was difficult. In addition, when the angle that is easy to find during regular inspection, for example, the angle θ exceeds 45 °, the restraining line 50 breaks in a short period of time due to the shaking of the weight 20, so there is a high possibility of falling before discovery.

  In Patent Document 1, a wire rope having a predetermined length is inserted and bent through insertion holes provided on the left and right sides of a fall prevention plate attached to a cap of a clamp body, and the vicinity of a vibration node when a weight undergoes secondary resonance. The end of the wire rope is collectively compressed and fixed to the weight by the dovetail sleeve, and the wire rope is at least of the deterrent line so that tension does not act on the wire rope even if the deterrence line resonates and swings excessively. There is a description that the length is 10 to 20% or more from the length.

JP 2006-230172 A

  The present invention has been made to solve such a problem. The purpose of the present invention is to prevent the weight of the double torsional damper from having a weight fall-preventing mechanism. Provided is a double torsional damper in which breakage does not occur and breakage is easily detected during periodic inspection.

The double torsional damper of the present invention is a double torsional damper comprising a deterrence line, a weight fixed to both ends of the deterrence line, and an electric wire gripping clamp fixed to the center part of the deterrence line. And a plurality of outer peripheral lines formed by being twisted around the outer periphery of the core part, and the core part has a pipe, a wire penetrating the pipe, and wire stoppers attached to both ends of the wire , the weight has a fixing portion, the fixing portion has a pipes compression bore, the portion and the portion of the pipe peripheral line, is compressed secured to pipes compression hole, pipe, pipe compression holes The wire is inserted into the pipe, has a predetermined length from both ends of the pipe, is fixed by a wire stopper, and both ends of the pipe are hermetically sealed.

  The predetermined length of the wire of the double torsional damper of the present invention is characterized in that it has a length required for the weight to hang down vertically when the pipe breaks.

  According to the present invention, since the deterrence wire of the double torsional damper has a mechanism for preventing the weight from falling, the weight of the deterrence wire is prevented from falling due to the breakage of the deterrence wire. It is possible to provide a double torsional damper that can be found and replaced.

The damper block diagram which shows the structure of the double torsional damper of this invention. FIG. 3 is a half sectional view of a deterrence line showing the configuration of the deterrence line according to the present invention. FIG. 4 is a destructive line break diagram showing a state of a weight when the deterred line breaks according to the present invention. The damper block diagram which shows the structure of the conventional double torsional damper. The inhibition line fracture | rupture figure which shows the state of the weight at the time of the conventional inhibition line fracture | rupture.

  Embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a damper configuration diagram showing the configuration of the double torsional damper of the present invention. In FIG. 1, except for the inhibition line 10 and the fixing portion 25, the description is omitted because it is the same as the case of FIG. 4.

The restraining wire 10 includes a core wire portion 11 and a plurality of outer peripheral wires 12, and the core wire portion 11 includes a pipe 13, a wire 15, and a wire stopper 17. Fixing portion 25 of the weight 20 has a pipes compression holes 27. A portion of a part and the pipe 13 of the peripheral line 12 is compressed secured in the pipe compression bore 27. Wire 15 is inserted into the pipe 1 in 3, and is fixed by a wire stopper 17 from both ends of the pipe 13 has a predetermined length. Both ends of the pipe 1 3 is sealed by the hermetically sealed 18.

FIG. 2 is a cross-sectional side view of a deterrence line showing the configuration of the deterrence line according to the present invention. 2, a portion of a part and the pipe 13 of the peripheral line 12 of deterrence line 10 is compressed secured in pipes compression bore 27 of the fixing portion 25 of the weight 20. Among these, the pipe 13 passes through the pipe compression hole 27. The wires 15 inserted into the pipe 13 have predetermined lengths at both ends of the pipe 13 and are fixed by wire stoppers 17. Both ends of the pipe 13 are hermetically sealed. The pipe 13 and the wire 15 are preferably made of stainless steel.

  FIG. 3 is a breakage line break diagram showing a state of the weight when the breakage line breaks according to the present invention. FIG. 3 shows a state in which new vibrations that act to cancel vibrations due to Karman vortices are repeatedly generated in the deterrence line 10 over a long period of time, and the outer peripheral line 12 and the pipe 13 on one side of the deterrence line 10 are broken. Yes. In this case, when the pipe 13 is broken, the weight of the weight 20 causes a wire having a predetermined length at both ends of the pipe 13 to be fed, so that the weight 20 hangs vertically but does not fall. Since this abnormal state can be easily detected at the time of periodic inspection, it can be immediately replaced with a new damper.

  As described above, according to the present invention, since the deterrence wire of the double torsional damper has a mechanism for preventing the weight from falling, the weight is prevented from falling due to the breakage of the deterrence wire, and at the time of periodic inspection, It is possible to provide a double torsional damper that can easily detect an abnormality in a deterrence line and replace it.

DESCRIPTION OF SYMBOLS 10 Deterrence line 12 Peripheral line 13 Pipe 15 Wire 17 Wire stop 18 Airtight seal 20 Weight 25 Adhering part 27 Peripheral line, Pipe compression hole 28 Adhering part 30 Electric wire holding clamp 35 Clamp part 37 Inhibition line compression hole 40 Overhead electric wire 50 Conventional Deterrence line 100 Double torsional damper according to the present invention 110 Conventional double torsional damper
θ Bending angle

Claims (2)

In a double torsional damper comprising a restraining wire, a weight secured to both ends of the restraining wire, and an electric wire gripping clamp secured to a central portion of the restraining wire,
The inhibition wire is composed of a core wire portion and a plurality of outer peripheral wires formed by being twisted around the outer periphery of the core wire portion,
The core portion has a pipe, a wire penetrating the pipe, and wire stoppers attached to both ends of the wire,
The weight has a fixing portion, the fixing portion has a pipes compression hole,
Wherein A portion and a portion of the pipe peripheral line, is compressed secured before Kipa type compression bore,
The pipe passes through the pipe compression hole,
The wire is inserted into the pipe, has a predetermined length from both ends of the pipe, and is fixed by the wire stopper,
The double torsional damper is characterized in that both ends of the pipe are hermetically sealed.   The double torsional damper according to claim 1, wherein the predetermined length of the wire has a length required for the weight to hang vertically when the pipe is broken.

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